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INSTRUCTION DESCRIPTIONS

A - 188 INSTRUCTION SET DETAILS MOTOROLA

Note: The MOVE A,Y:ea operation will result in a 24-bit positive or negative saturation

constant being stored in the specified 24-bit Y memory location if the signed integer por-

tion of the A accumulator is in use.

Instruction Format:

( . . . . . ) Y:ea,D

( . . . . . ) S,Y:ea

( . . . . . ) #xxxxxx,D

Opcode:

Instruction Fields:

ea=6-bit Effective Address=MMMRRR

Effective

Read S 0 (Rn)-Nn 0 0 0 r r r

Write D 1 (Rn)+Nn 0 0 1 r r r

(Rn)- 0 1 0 r r r

(Rn)+ 0 1 1 r r r

(Rn) 1 0 0 r r r

(Rn+Nn) 1 0 1 r r r

-(Rn) 1 1 1 r r r

Absolute address 1 1 0 0 0 0

Immediate data 1 1 0 1 0 0

where “rrr” refers to an address register R0–R7

Y: Y Memory Data Move Y:

23 16 15 8 7 0

OPTIONAL EFFECTIVE ADDRESS EXTENSION

0 1 d d 1 d d d W 1 M M M R R R INSTRUCTION OPCODE